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David Williams has been bitten six times by deadly snakes - and survived to tell the tales. The former snake handler now turned research scientist has devoted his life to helping snake bite victims. David works in Papua New Guinea where up to 4000 people are bitten by venomous snakes each year. Many of them die because they can't get to hospital quickly enough - and because anti-venom is expensive and in short supply. Now David has come up with a cheap and effective new anti-venom to tackle the problem. He tells Matthew Bannister how he developed his fascination with reptiles. Picture: David Williams milks the venom of a Papua New Guinea Taipan snake Credit: David Williams